package dfbz.demo03;

public class Test04 {
    public static void main(String[] args) {
        int num1 = 1;
        int num2 = 1;
        int count = 0;
        for (int i = 3; i <= 21; i++) {
            count = num1 + num2;
            num2 = num1;
            num1 = count;
        }
        System.out.println(count);
    }
}
